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- W2069062215 abstract "A dynamic mechanical method and electron microscopy have been used to study butadiene-styrene (BDST) thermoplastic elastomers of different compositions. The effect of the number of blocks present in the polymer chains at a fixed composition and molecular weight on the properties of these block copolymers has been established. The minimal block dimensions at which the polymers would behave like random copolymers have been estimated. Three-block copolymers with 40% styrene were found to have decreasing elasticity and loss moduli when the molecular weight increased from 7 × 10 4 to 65 × 10 4 , while the tensile strength passes through a maximum. The electron microscopic studies showed laminar structures to form in the block copolymers, in which the molecular weight changed from 7 × 10 4 to 17 × 10 4 . When the latter increased to 65 × 10 4 , the macromolecular structure changes from the laminar to the globular. The method of sample preparation (from the melt or solution) greatly affected the mechanical properties and morphology of the copolymers with a large molecular weight." @default.
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- W2069062215 date "1974-01-01" @default.
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- W2069062215 title "The mechanical properties and morphology of butadiene-styrene block-copolymers of different compositions" @default.
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- W2069062215 doi "https://doi.org/10.1016/0032-3950(74)90405-5" @default.
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